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Abstract

Ultrafast fiber lasers operating in the near-infrared have revolutionized laser science by enabling numerous breakthroughs in both fundamental science and industrial applications. In this Letter, we extend the spectral coverage of these laser sources to the mid-infrared by reporting the first femtosecond fiber laser operating near 3 μm. This passively mode-locked fiber ring laser based on nonlinear polarization evolution in an Er3+-doped fluoride glass fiber generates 207 fs pulses at 2.8 μm with an estimated peak power of 3.5 kW. This demonstration paves the way for further developments of promising applications in the molecular fingerprint region such as frequency comb spectroscopy.

(a) Measured output pulse train with a 2 ns rise time detector. The corresponding repetition rate is 55.2 MHz. (b) Zoom on one pulse of the 2.8 μm output (black) and the second harmonic (red) signal measured with a 100 ps rise time detector.